/* ============================================
   CCC - Co-Create Consciousness
   Shared Design System v5.0
   Style: Japanese Editorial Minimal
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Serif+JP:wght@400;700&display=swap');

:root {
  /* ── Backgrounds ── */
  --bg-base:       #FFFFFF;
  --bg-surface:    #F8F7F5;
  --bg-subtle:     #F2F0ED;

  /* ── Text ── */
  --text-primary:   #1A1917;
  --text-secondary: #4A4845;
  --text-muted:     #8C8884;
  --text-inverse:   #FFFFFF;

  /* ── Accent (stone-sage) ── */
  --accent:         #3D5A52;
  --accent-hover:   #2E4540;
  --accent-light:   #EBF0EE;
  --accent-mid:     #6B8E83;

  /* ── Borders ── */
  --border:         #E4E2DE;
  --border-strong:  #C8C4BE;

  /* ── Shadows ── */
  --shadow-sm:  0 1px 3px rgba(26,25,23,.06);
  --shadow-md:  0 4px 16px rgba(26,25,23,.08);
  --shadow-lg:  0 12px 40px rgba(26,25,23,.10);

  /* ── Typography ── */
  --font-sans:  'Noto Sans JP', system-ui, sans-serif;
  --font-serif: 'Noto Serif JP', Georgia, serif;

  --text-xs:   0.6875rem;
  --text-sm:   0.8125rem;
  --text-base: 0.9375rem;
  --text-md:   1.0625rem;
  --text-lg:   1.25rem;
  --text-xl:   1.5625rem;
  --text-2xl:  2rem;
  --text-3xl:  2.75rem;
  --text-hero: clamp(2.25rem, 5vw, 3.5rem);

  /* ── Radii ── */
  --radius-sm:   0.375rem;
  --radius-md:   0.75rem;
  --radius-lg:   1.5rem;
  --radius-full: 9999px;

  /* ── Transitions ── */
  --tr-fast:   .15s ease;
  --tr-normal: .3s ease;
  --tr-slow:   .7s ease;
}

/* ─── Reset ─────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html  { scroll-behavior: smooth; font-size: 16px; }
body  { font-family: var(--font-sans); color: var(--text-primary);
        background: var(--bg-base); line-height: 1.8; overflow-x: hidden; }
h1,h2,h3,h4,h5,h6 { font-family: var(--font-serif); line-height: 1.25; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }

/* ─── Navigation ────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  padding: 0 2rem;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(255,255,255,0);
  border-bottom: 1px solid transparent;
  transition: background var(--tr-normal), border-color var(--tr-normal);
}
.nav.scrolled {
  background: rgba(255,255,255,.97);
  border-bottom-color: var(--border);
}
.nav-logo { display: flex; align-items: center; gap: .75rem; }
.nav-logo-mark {
  width: 36px; height: 36px; border-radius: 50%;
  border: 2px solid var(--text-primary);
  background: transparent;
  display: grid; place-items: center;
  font-weight: 700; font-size: .875rem; color: var(--text-primary);
}
.nav-logo-text { color: var(--text-primary); font-size: 1rem; font-weight: 700; letter-spacing: .04em; }
.nav-logo-text span { color: var(--text-muted); font-size: .7rem; display: block; letter-spacing: .08em; }
.nav-links { display: flex; align-items: center; gap: 1.75rem; }
.nav-links a {
  color: var(--text-secondary); font-size: .875rem; letter-spacing: .02em;
  transition: color var(--tr-fast); position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 1px; background: var(--accent);
  transform: scaleX(0); transition: transform var(--tr-normal);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-cta {
  background: var(--text-primary) !important;
  color: var(--bg-base) !important;
  padding: .5rem 1.25rem; border-radius: var(--radius-full);
  font-weight: 600; font-size: .8125rem; letter-spacing: .02em;
  transition: background var(--tr-normal) !important;
}
.nav-cta:hover { background: var(--accent) !important; }
.nav-cta::after { display: none !important; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; z-index: 201; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text-primary); transition: var(--tr-normal); border-radius: 2px; }

/* ─── Buttons ───────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .875rem 1.875rem; border-radius: var(--radius-full);
  font-size: var(--text-base); font-weight: 600; letter-spacing: .01em;
  border: none; transition: background var(--tr-normal), color var(--tr-normal), border-color var(--tr-normal);
  cursor: pointer; text-align: center;
}
.btn-primary { background: var(--text-primary); color: var(--bg-base); }
.btn-primary:hover { background: var(--accent); }
.btn-secondary {
  background: transparent; color: var(--text-primary);
  border: 1.5px solid var(--border-strong);
}
.btn-secondary:hover { background: var(--bg-subtle); border-color: var(--text-secondary); }
.btn-outline {
  background: transparent; color: var(--text-primary);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { background: var(--bg-surface); border-color: var(--text-secondary); }
.btn-lg { padding: 1.125rem 2.5rem; font-size: var(--text-md); }
.btn-sm { padding: .625rem 1.25rem; font-size: var(--text-sm); }

/* ─── Layout helpers ────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.section { padding: 6rem 2rem; }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-label {
  display: inline-block; font-size: var(--text-xs); font-weight: 500;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 1rem;
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 400;
  color: var(--text-primary); margin-bottom: 1rem;
}
.section-subtitle { font-size: var(--text-md); color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }

/* ─── Cards ─────────────────────────────── */
.card {
  background: var(--bg-surface); border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--border);
  transition: border-color var(--tr-normal);
}
.card:hover { border-color: var(--border-strong); }

/* ─── Page Header (inner pages) ─────────── */
.page-header {
  background: var(--bg-surface);
  padding: 9rem 2rem 5rem; text-align: center;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.page-header-content { position: relative; z-index: 1; }
.page-header-label {
  display: inline-block; font-size: var(--text-xs); letter-spacing: .18em;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 1rem;
}
.page-header h1 { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: 1rem; color: var(--text-primary); font-weight: 400; }
.page-header p { font-size: var(--text-md); color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* ─── Footer ────────────────────────────── */
.footer { background: var(--bg-subtle); color: var(--text-secondary); padding: 5rem 2rem 2rem; border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; max-width: 1200px; margin: 0 auto 3rem; }
.footer-brand .nav-logo-text { font-size: 1.25rem; color: var(--text-primary); }
.footer-brand p { font-size: var(--text-sm); line-height: 1.9; margin-top: 1rem; color: var(--text-muted); }
.footer-nav h4 { color: var(--text-primary); font-size: var(--text-xs); letter-spacing: .12em; text-transform: uppercase; margin-bottom: 1rem; font-family: var(--font-sans); font-weight: 600; }
.footer-nav li + li { margin-top: .5rem; }
.footer-nav a { font-size: var(--text-sm); color: var(--text-muted); transition: color var(--tr-fast); }
.footer-nav a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 1.5rem; display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; font-size: var(--text-sm); color: var(--text-muted); }

/* ─── Layer color system ─────────────────── */
.layer-1 { --lc: #5B4B8A; --lb: #F2F0F8; }
.layer-2 { --lc: #8A6030; --lb: #F7F3EE; }
.layer-3 { --lc: #3A5480; --lb: #EEF2F8; }
.layer-4 { --lc: #8A4860; --lb: #F8F0F3; }
.layer-5 { --lc: #3D6655; --lb: #EEF5F2; }
.layer-6 { --lc: #6B4030; --lb: #F5EFEA; }
.layer-7 { --lc: #2E5870; --lb: #EBF3F8; }

/* ─── Animations ────────────────────────── */
@keyframes fadeInUp { from { opacity:0; transform:translateY(24px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeIn   { from { opacity:0; } to { opacity:1; } }

/* Scroll reveal */
.reveal { opacity:0; transform:translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity:1; transform:translateY(0); }

/* ─── Responsive ────────────────────────── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-links {
    display: none; position: fixed; inset: 0;
    background: rgba(255,255,255,.98);
    flex-direction: column; justify-content: center; align-items: center; gap: 2.5rem;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.2rem; color: var(--text-primary); }
  .hamburger { display: flex; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; gap: .5rem; text-align: center; }
  .section { padding: 4rem 1.25rem; }
}